The LXNAV S7 is a standalone digital speed-to-fly variometer and final glide calculator with GPS input and PDA/PNA input/output. A rotary switch with push button is used to setup all the parameters. A mixture of mechanical classical needle operated by a stepper motor and a 2 inch extremely bright display. It fits into a 57mm size hole, which is a standard size on the instrument panel. PDAs or Smartphones can be connected to the system via an external Bluetooth module or directly plugged to the PDA port. External GPS (Flarm) allows a final glide calculation to the target. Speed to fly indication with easy one finger setting change of Mc, Ballast or Bugs. Pre-loaded polar database for almost all gliders.